Combustion gas baffle arrangement for furnace interiors



J. STANWYCKS 2,565,328 COMBUSTION GAS BAFFLEI ARRANGEMENT FOR FURNACE INTERIORS Aug. 21, 1951 Original Fi led Nov. 24, 1945.

lN VEN TOR JOHN Smwwvcxs Patented Aug. 21, 1951 COMBUSTION GAS BAFFLE ARRANGEMENT FOR FURNACE INTERIORS John Stanwycks, Hempstead, N.

Substituted for application Serial No. 630,650, November 24, 1945. This application June 17, 1948, Serial No. 33,643

3 Claims.

This invention relates in general to apparatus for heat control, and in particular to apparatus for controlling and conserving heat and fuel in a furnace or the like. This is a substitute for my abandoned application, filed on November 24, 1945, Serial Number 630,650.

In the conventional type furnace, a system of baffles is occasionally employed to further utilize the heat generated by the burning fuel, but the heat once passing out of the furnace is generally lost. Accordingly, it is an object of this invention to provide apparatus for controlling and conserving the normally wasted heat which passes into the fiue from the furnace or like heating source.

It is a further object of the invention to provide means for utilizing the normally wasted heat to send heat to a boiler or the like from the outside of the furnace or boiler.

Additional objects of the invention as well as its construction, use and operation will in part be obvious and will in part become apparent from. the following disclosure and claims.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

-In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a furnace assem bly according to the present invention.

Fig. 2 is a vertical cross section of the assembly shown in Fig. 1, taken along the line 22.

Fig. 3 is a perspective view of the furnace assembly shown in Fig. l, with the outside wall removed to illustrate the structure thereof.

Fig. 4 is a fragmentary perspective view of the internal portion of the furnace shown in Figs. 1 to 3, with a portion of a wall broken away to show the structure and air passageway of the furnace arrangement.

Referring to the figures in detail, there is shown a furnace assembly generally designated Ill comprising in general an inner furnace H and an outer furnace body l2, of insulation material, with a baille wall arrangement generally designated l3. The furnace is of conventional construction, having a firebox, boiler or other heating chamber, flue, and the like which are conventional in structure and arrangement, and which are not set forth specifically in the figures, inasmuch as a specific illustration of these features would serve only to cloud the true nature of the invention in a maze of drawings and figures.

Also provided on the furnace may be conventional heat controls such as, a thermostat control, or the like (also not shown in the figures). Likewise, there may be a stoker, oil burner M or the like which is shown in outline in the figure positioned outside the outer furnace body [2 and having an extension projecting therewithin.

The boiler or heating chamber of the furnace is conventionally positioned adjacent to the outer wall of the furnace, with any conventional baffle arrangements therewithin to insure the maximum heat transfer between the exit gases and the heating chamber prior to the passage of the gases into the flue [5 or chimney of the furnace.

Positioned somewhat above the opening of the fiue l5, which terminates only slightly above the top of the furnace II, is a horizontal baflle wall it, having a vertical front baffle wall I8 extending therefrom, meeting the top of the furnace l l, and extending partially down the sides of the furnace, preferably about half to two thirds of the way down the furnace. This front baflle wall is positioned substantially along the vertical axis of the furnace, having nearly half the furnace behind the wall and the other half in front. The

front baffle wall [8, likewise fits snugly around the outer wall of the furnace, and substantially prevents passage of air or gases between the wall and the furnace.

Meeting the ends of the front wall 18, and spaced from the furnace are two vertical side walls ll which extend down from the horizontal baffle wall It and terminate level with the lower edge of the front baflle wall l8. Likewise extending down from the horizontal or top baffle wall It, and likewise spaced from the furnace is a rear vertical bafile wall 26, which terminates at the floor or base 2| of the furnace, and which optionally serves additionally as a supporting wall for the baffle arrangement I3. The bottom of the baffle arrangement or chamber I3, as defined by the lower edges of the front bafile wall l8 and the side bafile walls I1, is open to permit air or exit gases to escape therefrom.

The front bafile wall [8, is provided with vertical guides 38, in which is disposed slide 3!. This slide 3i is provided with a plurality of slots or openings 32, which in turn are so constructed that they may be aligned or disaligned with corresponding openings 33 located in front baflie wall it, merely by adjusting the position of slide 3|. The position of slide 3| may be adjusted manually, mechanically, or electrically as may be esired.

The slots or openings 32 provide a further exit for the exhaust gases, from the baliie arrangement l3, to create a turbulent action of the gases passing through the space between the furnace H and the outer furnace body l2 to be delayed in their passage to the flue pipe 23 so as to have a greater heating effect upon the furnace H.

The outer furnace body i2 is positioned around this furnace and baffle assembly, optionally close- 1y 'therearound as shown in the figures, in which case the outer furnace body serves to support the baffle walls, and is supportingly connected to the inner furnace body. Alternately, the outer furnace body may be spaced from the furnace wall, in which case there is added insulating effect between the inner furnace body and the outside space, at the expense of the supporting features of the outer furnace body, and at the expense of slight additional space required for the assembly. Inasmuch as the average home owner is highly desirous of a minimum sized furnace, the presently preferred form of the invention contemplates a close fitting wall to conserve space; however, for large industrial uses, the saving of fuel, by means of the additional insulating value of the slight added space, will make increasingly valuable the spaced walls.

In the top wall of the outer furnace body there are openings to permit passage of the steam or other heating medium through pipe 22 and to permit passage of the exit gases through pipe 23 which leads to the chimney (not shown). Likewise in the top, in the front, and in the sides of the outer furnace body l2 there are openings 24, 25, and 26 which permit servicing or cleaning of the furnace. The side opening 26, on at least one side of the assembly, is at a level with the lower edge of the side baffle walls ll, so that both the outside and the inside of the baffle walls may be reached through this opening.

Communication with the firing source or fuel supply optionally occurs through pipe 28, which is shown in Fig. 2 as leading to the oil burner mechanism Hi. Alternatively, in a hand fired coal furnace this communication may be accomplished through a door or the like (not shown in the figures) according to conventional practice.

The entire furnace and insulating assembly optionally rests on an insulating base 2! as previously described, or alternatively it may rest directly on the floor of the furnace room.

The wall of the furnace is of a non-insulating material, and if it is desired to use this invention in connection with a conventional insulated furnace, the insulation thereon is first removed. This permits the ready transfer of heat from the space between the furnace l l and the outer furnace body l2, so that the full advantage is obtained from the heat in this space.

The outer furnace body I2 is constructed of a suitable heat-insulating material, preferably structurally strong, such as for example, a brick wall, a stiffened asbestos, a glass wool insulated double-walled metal, or the like. The choice of this insulating material will be apparent from the above description of presently preferred materials.

Suitable insulating connections of conventional materials, such as, for example, an insulating ring 29 between pipe 22 and the insulating wall if will be added to close cracks and other openings in the structure. These insulations are optionally of asbestos or a similar, somewhat flexible insulating material which may be fitted closely to the opening to be insulated.

Variations and modifications of the invention will be apparent to those skilled in the art. For example, a vertical baffle (not shown in the figures) may be added between the side baflie walls and parallel therewith, to divide into two parts the baffle chamber enclosed by the baffle walls iii, if, i8 and 26. Other similar modifications, based on the individual needs and requirements may also be made.

The operation of this assembly is as follows:

The gases from the furnace exit l5 are directed against the top bafiie wall, and are thereby deflected downward, passing below the front and side bafiie walls. This causes the heated exit gases to pass substantially completely around the outside of the furnace boiler as indicated by arrows in Fig. 2, and thereby causes the gases to heat the boiler from the outside. The gases are permitted to escape through pipe 23, after passing down along the back of the furnace, up along the front, and then back along the top, thereby substantially covering the outer wall of the furnace, and transferring substantially all the available heat to the boiler or heating chamber.

Except for the operation of the bafiie system to obtain the maximum value from the fuel, the operation of the furnace is conventional, and may include conventional heat control and fuel saving devices.

While I have illustrated and described the preferred embodiment of my invention, it is to be understood that I do not limit myself to the precise construction herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

1. In a furnace having an inner furnace body formed with a top line discharge and enclosed within an outer furnace body having a top wall spaced above the top of the inner furnace body and formed with a top flue pipe substantially over the top flue discharge and having side and rear walls spaced from the adjacent side and rear walls of the inner furnace body, a baffle arrangement within the space between the inner furnace body and the outer furnace body for causing heated gases discharging from the flue discharge of the inner furnac body to pass over and around the outside of the inner furnace body before discharging through the flue pipe of the outer furnace body, comprising a front bafiie wall extended laterally and vertically across the top of the inner furnace body between the top flue discharge and the front of the inner furnace body and having side portions extended past the top side edges of the inner furnace body, said front bafiie wall having its top edge located below and spaced from the inside face of the top wall of the outer furnace body, a horizontal baflie wall extended from the top edge of said front bafiie wall rearward to the rear wall of the outer furnace body and laterally extended between the outer edges of said front baliie wall, said front baffle wall having depending portions at its sides extended downward from the bottom edges of said extended side portions and alon the sides of the inner furnace body in the spaces between the side walls of the inner furnace body and the side walls of the outer furnace body, said depending portions of said front baflle wall having their bottom edges located above the bottom of the furnace body, and side walls mounted between the outer edges of said front baffle wall and the rear wall of the outer furnace body and extended from said horizontal baille wall to the bottom edges of said depending portions of said front baffle wall, so arranged and constructed that heated gases discharging from the top flue discharge of the inner furnace body will be deflected downward by said horizontal baffle wall and confined by said front baffle wall, the rear wall of the outer furnace body and said side walls to pass around the bottom edges of the depending portions of said front bafile wall and thence upward along the front face of said front baffle wall to the top flue pipe of the outer furnace body.

2. In a, furnace having an inner furnace body formed with a top flue discharge and enclosed within an outer furnace body having a top wall spaced above the top of the inner furnace body and formed with a top flue pipe substantially over the top flue dischar e and having side and rear walls spaced from the adjacent side and rear walls of the inner furnace body, a baffle arrangement within the space between the inner furnace body end the outer furnace body for causing heated gases discharging from the flue discharge of the inner furnace body to pass over and around the outside of the inner furnace body before discharging through the flue pipe of the outer furnace body, comprising a front baflle wall extended laterally and vertically across the top of the inner furnace body between the top flue discharge and the front of the inner furnace body and having side portions extended past the top edges of the inner furnace body, said front baffle wall having its top edge located below and spaced from the inside face of the top wall of the outer furnace body, a horizontal baffle wall extended from the top edge of said front baflle wall rearward to the rear wall of the outer furnace body and laterally extended between the outer edges of said front bafiie wall, said front baffle wall havin depending portions at its sides extended downward from the bottom edges of said extended side portions and along the sides of the inner furnace body in the spaces between the side walls of the inner furnace body and the side walls of the outer furnace body, said depending portions of said front baiiie wall having their bottom edges located above the bottom of the furnace body, and side walls mounted between the outer edges of said front baffle wall and the rear wall of the outer furnace body and extended from said horizontal baffle wall to the bottom edges of said depending portions of said front baffle wall, so arranged and constructed that heated gases discharging from the top flue discharge of the inner furnace body will be deflected downward by said horizontal bafile wall and confined by said front bafile wall, the rear Wall of the outer furnace body and said side walls to pass around the bottom edges of the depending portions of said front baflle wall and thence upward along the front face of said front baffle wall to the top flue pipe of the outer furnace body, said depending portions of said front baflie wall bein formed with openings through which some of the heated gases pass before passing down about the bottom edges of those depending portions to create a turbulent action on the heated gases.

3. In a furnace having an inner furnace body formed with a top flue discharge and enclosed Within an outer furnace body having a top wall y 6 spaced above the top of the inner furnace body and formed with a top flue pipe substantially over the top flue discharge and having side and rear walls spaced from the adjacent side and rear walls of the inner furnace body, a bafiie arrangement within the space between the inner furnace body and the outer furnace body for causing heated gases dischargin from the flue discharge of the inner furnace body to pass over and around the outside of the inner furnace body before discharging through the flue pipe of the outer furnace body, comprisin a front baffle wall extended laterally and vertically across the top of the inner furnace body between the topflue discharge and the front of the inner furnace body and having side portions extended past the top edges of the inner furnace body, said front baffle wall having its top edge located below and spaced from the inside face of the top wall of the outer furnace body, a horizontal baflle wall extended from the top edge of said front bafile wall rearward to the rear wall of the outer furnace body and laterally extended between the outer edges of said front baflle wall, said front bafiie wall having depending portions at its sides extended downward from the bottom edges of said extended side portions and along the sides of the inner furnace body in the spaces between the side walls of the inner furnace body and the side walls of the outer furnace body, said depending portions of said front bafiie wall having their bottom edges located above the bottom of the furnace body, and side walls mounted between the outer edges of said front baiiie wall and the rear wall of the outer furnace body and extended from said horizontal baiile wall to the bottom edges of said depending portions of said front bafile wall, so arranged and constructed that heated gases discharging from the top flue discharge of the inner furnace body will be deflected downward by said horizontal baille wall and confined by said front baflle wall, the rear wall of the outer furnace body and said side walls to pass around the bottom edges of the depending portions of said front bafile wall and thence upward along the front face of said front baflie wall to the top flue pipe of the outer furnace body, said depending portions of said front baffle wall being formed with openings through which some of the heated gases pass before passing down about the bottom edges of those dependin portions to create a turbulent action on the heated gases, and manually operable means for opening and closing said openings formed in the depending portions of said front baflle wall.

JOHN STANWYCKS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,262,713 Streeper Apr. 16, 1918 2,064,080 Powers Dec. 15, 1936 2,159,221 Mills May 23, 1939 FOREIGN PATENTS Number Country Date 166,342 Great Britain July 12, 1921 196,766 Great Britain May 3, 1923 

